Drinking Water Treatment – Questions/Solutions

Drinking Water Treatment – Questions/Solutions

A water sample has been filtered for an analysis of color. which type of
color can be determined from the filtrate ? Correct Ans - true color

Federal Safe Drinking Water Act (SDWA 1974): Correct Ans - -
1974.
- EPA Develop primary drinking water standards

Public water system would comply with the act Correct Ans - - have
at least 15 service connections
- regularly serve at least 25 people at least 60 days out of the year

5 main Rule Correct Ans - - 62-550 Drinking water standards,
monitoring, and reporting
- 62-555 Permitting, construction, operation and maintenance of public
water
- 62-560 requirements for public water systems that are out of compliance
- 62-602 Drinking water and domestic wastewater treatment plant
operators
- 62-699 Classification and staffing of water or domestic wastewater
treatment plants and water distribution systems

Acording to FDEP chapter 62-602 FAC and operator could have his license
permanently revoked for doing what? Correct Ans - Falsified or
misrepresented reports, logs, or lab sheets

A tier one violation requires the utility to notify the public within what
time frame ?? Correct Ans - 24 hours

Acording to FDEP chapter 62-550.519 Radionuclides, routine monitoring
for all water systems for radionuclides will take place how often ?
Correct Ans - Every 3 years

Acording to FAC Chapter 62-550.824 consumer confidence reports (CCR)
shall be delivered to the costumer by which date each year ?? Correct
Ans - July 1

,What are primary MCLs ? Correct Ans - The MCLs than can pose a
direct threat to human health

Example of primary MCLs ? Correct Ans - Coliform Bacteria
Nitrate/ Nitrite
Lead
Copper
Radiological

MCL for lead Correct Ans - 0.015 mg/L

Mcls for Copper Correct Ans - 1.3 mg/L

MCL for Nitrate Correct Ans - 10 mg/L

Mcls for turbidity Correct Ans - 5.0 NTU

Mcls for Total coliform Correct Ans - No more than 5% positive per
month (if sampling >40 perm month)

Maximun residual disinfectant levels (MRDL) for chlorine Correct Ans
- 4.0 mg/L as CL2

Maximun residual disinfectant level (MRDL) for Chloramines Correct
Ans - 4.0 mg/L as Cl2

Maximun residual disinfectant level (MRDL) for Chlorine Dioxide
Correct Ans - 0.8mg/L as CLO 2

Mcls for Trihalomenthanes Correct Ans - 0.080 mg/L

Mcls for Haloacetic acids (5) Correct Ans - 0.060 mg/L

Mcls for Color Correct Ans - 15 color Units

Mcls for Iron Correct Ans - 0.3 mg/L

Mcls for Manganese Correct Ans - 0.05 mg/L

,Mcls for pH Correct Ans - 6.5 - 8.5 SU

Mcls for Chloride Correct Ans - 250 mg/L

Mcls for TDS Correct Ans - 500 mg/L

Mcls for Odor Correct Ans - 3 threshold odor number (TON)

Mcls for arsenic Correct Ans - 0.010 mg/L

Mcls for Lead Correct Ans - 0.015 mg/L

Mcls for Nitrate Correct Ans - 10. mg/L

Mcls for Radium 226 & 228 Correct Ans - 5 pCi/L

Mcls for Fluoride Correct Ans - 4 mg/L

Mcls for Sodium Correct Ans - 160 mg/L

Secondary Mcls for copper Correct Ans - 1.0 mg/L

Secondary Mcls for Fluoride Correct Ans - 2 mg/L

A tier two violation requires the utility to notify the public within what
time frame Correct Ans - 30 days

Acording to FAC chapter 62-555 the minimum combined chlorine residual
in the distribution system when using chloramination is Correct Ans -
0.6 mg/L

A routine bacteriological test from a distribution sample has come back
positive for total coliform. Which statement is correct about the collection
of repeat samples Correct Ans - Collect three (3) repeat samples, all
on same day

Sea water contains Correct Ans - High TDS

Lakes and Reservoirs Correct Ans - High Turbidity

, Develop bacteria and coliform
Alga blooms result in taste and odor problems

Groundwater is tipically High in Correct Ans - Iron
Maganese
Fluoride
Chloride
Sulfate
Nitrate
Magnesium
Calcium
Hydrogen sulfide

Physical Factors that affect the quality of water Correct Ans - Color
Turbidity
Temperature
Taste
Odor

Capable of removing Chloride, Sodium, Calcium and Magnesium.
Good for brackish water source and direct seawater (saltwater) sources
Correct Ans - Reverse Osmosis (RO)

What is the most effective treatment method to threat A surface water
contains elevated amounts of bacteria, turbidity and color. Correct Ans
- Coagulation, flocculation ñ, sedimentation, filtration, and disinfection
(conventional filtration)

What is the most effective treatment method to threat A source water is
high in iron, manganese and hydrogen sulfide. Correct Ans -
Aeration followed by greensand filtration then disinfection

Problem with hardness Correct Ans - Scale form in boilers in
industrial plants which impedes heat transfer

Hardness Correct Ans - Is a measure of the soap or detergent
consuming power of water